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Title:RAZVOJ VISOKOTRDNOSTNIH LIVNIH ALUMINIJEVIH ZLITIN S KVAZIKRISTALI
Authors:Rozman, Niko (Author)
Zupanič, Franc (Mentor) More about this mentor... New window
Markoli, Boštjan (Co-mentor)
Files:.pdf DR_Rozman_Niko_2011.pdf (10,72 MB)
 
Language:Slovenian
Work type:Dissertation (m)
Organization:FS - Faculty of Mechanical Engineering
Abstract:V doktorski disertaciji je obravnavana problematika razvoja aluminijevih zlitin, ki vsebujejo nekatere izmed kompleksnih intermetalnih spojin, med drugim tudi kvazikristalne faze. Raziskovali smo vplive legirnih elementov in pogojev strjevanja na razvoj mikrostrukture ter posledičnega mehanskega obnašanja zlitin štirikomponentnega sistema Al-Mn-Be-Cu. Zato je bilo izdelanih več zlitin, ki so bile lite pri različnih pogojih. Razvoj zlitin je potekal na podlagi znane konstitucije trikomponentnega sistema Al-Mn-Cu in znanih vplivov kemijskega elementa berilija na aluminijeve zlitine sistema Al-Mn. S pomočjo raznih analiz, kot na primer mikrostrukturnih, kemijskih, termodinamskih in faznih, smo ugotovili fazno sestavo zlitin in razvoj mikrostrukture glede na kemijsko sestavo in ravnotežne razmere pri strjevanju. Med litjem smo zajemali ohlajevalne hitrosti in opredelili kritično ohlajevalno hitrost, potrebno za nastanek ikozaedrične kvazikristalne faze v sistemu Al-Mn-Be-Cu. Za odkrivanje vplivov fazne sestave na mehanske lastnosti zlitin so bili izvedeni tlačni in trdnostni preizkusi ter testi meritev mikrotrdote z uporabo naprave za zaznavanje globine vtiska. Ugotovljeno je bilo, da kvazikristalna faza, ki nastopa v teh zlitinah, povišuje napetost tečenja in duktilnost zlitin, zmanjšuje pa utrjevalni efekt med plastično deformacijo.
Keywords:aluminijeve zlitine, kvazikristali, metastabilno stanje, utrjevanje
Year of publishing:2011
Publisher:N. Rozman]
Source:[Maribor
UDC:669.715:539.4(043.3)
COBISS_ID:255876096 Link is opened in a new window
NUK URN:URN:SI:UM:DK:0RT7WJYQ
Views:2619
Downloads:479
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Categories:KTFMB - FS
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Secondary language

Language:English
Title:DEVELOPEMENT OF HIGH-STRENGTH QUASICRYSTALLINE CASTING ALUMINUM ALLOYS
Abstract:This work presents development of aluminium alloys which posses complex intermetallic phases; that is in this case quasicrystals. In quaternary phase system aluminium rich phase system Al-Mn-Be-Cu influence of alloying elements on microstructure development was investigated. To achieve this several alloys with similar chemical composition was casted under different solidification conditions. Investigations based on well known stable state phase system Al-Mn-Cu and previous results of beryllium influence in Al-Mn system. With help of different chemical, microstructural, structural and thermodynamical analysis microstructure and its development was determinated. For determination of critical cooling rate for formation of metastable quasicrystals, different thermoelements monitored the temperature dynamic in the regions of interest. Behaviour of quasicrystals and its influence during plastic deformation was investigated on basis of nanoidentation and compressive tests.
Keywords:aluimium alloys, quasicystals, metastable state, strengthening


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